.duanzi{
    display: flex;
    flex-wrap: wrap;
    margin: auto;
}
.duanzi li{
    text-align: center;
    list-style: none;
    width: 300px;
    height: 200px;
    border: 1px solid;
  
    margin: 10px 37px;
    font-size: 14px;
}
.duanzi li p{

}
.duanzi .model{
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(0, 0, 0, 0.3);

}
.duanzi .model div{
    width: 500px;
    min-height: 100px;
    background: white;
    position: fixed;
    left: 35%;
    bottom: 55%;
    text-align: center;
}
.duanzi .model div h2{
    float: right;
    cursor: pointer;
}